Table 3.

ECG findings in 53 women with pathogenic DMD variants.

General ECG measurements	Mean (SD)
PR interval (ms)	146.7 (21.9)
QRS interval (ms)	90.8 (12.8)
QT (ms)	401.0 (28.7)
QTc interval (ms)	422.5 (21.2)
DMD-specific abnormalities	Number (%)
R >4 mm V1	12 (23)
R >4 mm V2	32 (60)
R/S >1 in V1*	1 (2)
R/S >1 in V2*	3 (6)
Q in lateral leads >0.2 mV	1 (2)
Q in inferior leads >0.2 mV	1 (2)
RBBB	1 (2)
LBBB	1 (2)
Any DMD-specific change	33 (62)
Other measurements	Number (%)
IRBBB	8 (15)
Left ventricular hypertrophy	1 (2)
Right ventricular strain	4 (8)
Any ECG change	38 (72)

^*In the absence of complete or incomplete right bundle branch block.

RBBB, right bundle branch block; LBBB, left bundle branch block; IRBBB, incomplete right bundle branch block; DMD, Duchenne muscular dystrophy.